R.I. Gen. Laws § 4-1-23: Destruction of infirm animals by society.

If, upon examination by a licensed graduate veterinarian of any animal taken possession of under § 4-1-22, the veterinarian certifies, in writing, to the society that the animal is so aged, maimed, disabled, lame, sick, diseased, or injured as to be unfit for any useful purpose, any officer or agent of the society may lawfully and humanely destroy that animal or cause it to be humanely destroyed, and the society, its officers and agents, are exonerated from all liability to the owner of that animal on account of its destruction.